Ryan Kriener scored 11 points for the Hawkeyes (14-3, 3-3 Big Ten), who have won three straight after a 0-3 start to league play.

Iowa used a 9-0 run early in the second half to seize control, and Joe Wieskamp put Iowa ahead 53-41 with four straight free throws.

Wieskamp had gotten to the line by drawing star Kaleb Wesson's fourth foul, which came with 8:23 left. Wesson was held to a season-low two points on 1 of 5 shooting.

The flummoxed Buckeyes (12-4, 2-3) then threw a zone at Iowa, and Isaiah Moss drilled an open 3 to make it 59-45. But Iowa's raucous crowd went silent after Cook — who missed Wednesday's win at Northwestern with a sore knee — appeared to hurt his left ankle and was taken to the locker room with 4:08 left.

Ohio State's C.J. Jackson, the team's second-leading scorer at 13.1 points, didn't start for the first time this season. He has been dealing with leg cramps and finished with 10 points before fouling out with 20 seconds to go.

Ohio State: The Buckeyes got just two points from Wesson and Jackson in the first half — and led by two anyway. But Ohio State couldn't hang with the Hawkeyes with Wesson and Jackson in so much foul trouble.

Iowa: This was about as good as the Hawkeyes had looked all season. They overcame early struggles on the perimeter by pounding it inside. But losing Cook for an extended stretch would be critical.

POLL IMPLICATIONS

Losses to Rutgers and Iowa, albeit on the road, aren't very good ways to stay ranked. But will the Buckeyes tumble 10 spots and out of the poll? It'll be interesting to see if they do on Monday. The Hawkeyes, on the other hand, could return to the poll after a 2-0 week.

UP NEXT

Ohio State hosts Maryland on Friday.

Iowa plays at Penn State on Wednesday.

___

More AP college basketball: https://apnews.com/Collegebasketball and https://twitter.com/AP_Top25